Low-velocity liquid silicon rubber and preparation method thereof

A liquid silicone rubber, low-viscosity technology, applied in the field of rubber, can solve the problems of increased viscosity of liquid silicone rubber, low strength of liquid silicone rubber, affecting film formation and processing, etc., to achieve low viscosity, strong fluidity and processability , The effect of convenient potting

Inactive Publication Date: 2015-04-08
SUZHOU JIN TENG ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The strength of liquid silicone rubber is low, and after adding reinforcing fillers, its strength can be increased dozens of times, and the cost is reduced, but adding various reinforcing fillers will cause the viscosity of liquid silicone rubber to increase and flow The performance is poor, which affects its film formation and processing, and limits its application range, so it is necessary to improve the liquid silicone rubber

Method used

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  • Low-velocity liquid silicon rubber and preparation method thereof
  • Low-velocity liquid silicon rubber and preparation method thereof
  • Low-velocity liquid silicon rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A low-viscosity liquid silicone rubber, which is composed of A component and B component in a weight ratio or volume ratio of 1:1, wherein,

[0027] In parts by weight, component A includes:

[0028]

[0029] In parts by weight, component B includes:

[0030]

[0031] Among them, fumed silica and calcium carbonate in component A are used as reinforcing agents to improve the tear resistance, heat resistance, and aging resistance of silicone rubber products.

[0032] The platinum compound or chloroplatinic acid complex in component A acts as a catalyst, and the vinyl group in the vinyl-containing polydiorganosiloxane and the silicon-hydrogen bond in the crosslinking agent undergo silicon hydrogenation under the action of a platinum-based catalyst Addition reaction, so that the linear base polymer is cross-linked into a three-dimensional network structure under the action of a cross-linking agent to become an elastomer. In this embodiment, a chloroplatinic acid com...

Embodiment 2

[0047] A low-viscosity liquid silicone rubber, which is composed of A component and B component in a weight ratio or volume ratio of 1:1, wherein,

[0048] In parts by weight, component A includes:

[0049]

[0050] In parts by weight, component B includes:

[0051]

[0052] Among them, the platinum compound or chloroplatinic acid complex in component A is used as a catalyst, and the vinyl group in the vinyl-containing polydiorganosiloxane and the silicon-hydrogen bond in the crosslinking agent occur under the action of the platinum series catalyst Hydrosilylation reaction, so that the linear base polymer is cross-linked into a three-dimensional network structure under the action of a cross-linking agent to become an elastomer. In this embodiment, a platinum compound is selected as the catalyst, specifically platinum dioxide.

[0053] Inhibitors for component B are acetylenic alcohols.

[0054] The preparation method of A component, it comprises the steps:

[0055] 1...

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Abstract

The invention discloses low-velocity liquid silicon rubber which consists of a component A and a component B in a weight ratio or volume ratio of 1:1, wherein the component A comprises the following components in parts by weight: 90-120 parts of low-velocity methoxy end capping silicon oil, 4-8 parts of fumed silica, 4-8 parts of calcium carbonate, and 1-3 parts of a platinum compound or chloroplatinic acid complex; the component B comprises the following components in parts by weight: 90-120 parts of methylvinyl unvulcanized silicone rubber, 4-8 parts of fumed silica, 4-7 parts of polyethylene glycol, 4-7 parts of 2-thiol benzimidazole zinc salt, 3-6 parts of an inhibitor, 8-10 parts of methyl hydrogen-containing polysiloxane and 10-20 parts of an additive. The low-velocity liquid silicon rubber disclosed by the invention is high in transparence, low in velocity, relatively high in strength after being cured, relatively high in flowability and machinability, and can be conveniently filled to seal complex electronic components, and the velocity of the low-velocity liquid silicon rubber is kept being about 4000cps.

Description

technical field [0001] The invention relates to the technical field of rubber, in particular to a low-viscosity liquid silicone rubber and a preparation method thereof. Background technique [0002] Liquid silicone rubber products have high purity, good transparency, low volatile matter content, oil resistance, chemical resistance, wide range of color choices, aging resistance, light resistance, insulation, and heat insulation are particularly outstanding. It is precisely because liquid silicone rubber has so many advantages that it has been widely used in automobiles, construction, electronic power, medical care, mechanical engineering and other fields. [0003] The strength of liquid silicone rubber is low, and after adding reinforcing fillers, its strength can be increased dozens of times, and the cost is reduced, but adding various reinforcing fillers will cause the viscosity of liquid silicone rubber to increase and flow The performance is poor, which affects its film ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/06C08L83/07C08L83/05C08L71/08C08K13/02C08K3/36C08K3/26C08K5/37
Inventor 张国青孙政良
Owner SUZHOU JIN TENG ELECTRONICS TECH
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